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/********************************************************/
/* ntapi: Native API core library */
/* Copyright (C) 2013--2017 Z. Gilboa */
/* Released under GPLv2 and GPLv3; see COPYING.NTAPI. */
/********************************************************/
#include <psxtypes/psxtypes.h>
#include <ntapi/nt_status.h>
#include <ntapi/nt_unicode.h>
#include "ntapi_impl.h"
typedef struct ___two_bytes {
unsigned char low;
unsigned char high;
} __two_bytes;
typedef struct ___three_bytes {
unsigned char low;
unsigned char middle;
unsigned char high;
} __three_bytes;
static int32_t __fastcall __utf8_to_utf16_handler_1byte_or_null_termination(nt_utf8_callback_args * args)
{
/***************************/
/* from: 0xxxxxxx */
/* to: 00000000 0xxxxxxx */
/***************************/
wchar16_t * dst;
if (args->dst >= args->dst_cap)
return NT_STATUS_BUFFER_TOO_SMALL;
dst = (wchar16_t *)args->dst;
*dst = *(args->src);
/* advance source and destination buffer */
args->src++;
args->dst = (void *)((uintptr_t)(args->dst) + sizeof(wchar16_t));
/* bytes_written */
args->bytes_written += sizeof(wchar16_t);
return NT_STATUS_SUCCESS;
}
static int32_t __fastcall __utf8_to_utf16_handler_2bytes(nt_utf8_callback_args * args)
{
/***************************/
/* from: 110yyyyy 10xxxxxx */
/* to: 00000yyy yyxxxxxx */
/***************************/
__two_bytes * src; /* big endian */
wchar16_t * dst;
if (args->dst >= args->dst_cap)
return NT_STATUS_BUFFER_TOO_SMALL;
src = (__two_bytes *)args->src;
dst = (wchar16_t *)args->dst;
/* yyyyy */
*dst = (src->low ^ 0xC0);
*dst <<= 6;
/* xxxxxx */
*dst |= (src->high ^ 0x80);
/* advance source and destination buffer */
args->src += 2;
args->dst = (void *)((uintptr_t)(args->dst) + sizeof(wchar16_t));
/* bytes_written */
args->bytes_written += sizeof(wchar16_t);
return NT_STATUS_SUCCESS;
}
static int32_t __fastcall __utf8_to_utf16_handler_3bytes(nt_utf8_callback_args * args)
{
/************************************/
/* from: 1110zzzz 10yyyyyy 10xxxxxx */
/* to: zzzzyyyy yyxxxxxx */
/************************************/
__three_bytes * src; /* big endian */
wchar16_t * dst;
wchar16_t yyyyy;
if (args->dst >= args->dst_cap)
return NT_STATUS_BUFFER_TOO_SMALL;
src = (__three_bytes *)args->src;
dst = (wchar16_t *)args->dst;
/* zzzz */
*dst = (src->low ^ 0xE0);
*dst <<= 12;
/* yyyyy */
yyyyy = (src->middle ^ 0x80);
yyyyy <<= 6;
*dst |= yyyyy;
/* xxxxxx */
*dst |= (src->high ^ 0x80);
/* advance source and destination buffer */
args->src += 3;
args->dst = (void *)((uintptr_t)(args->dst) + sizeof(wchar16_t));
/* bytes_written */
args->bytes_written += sizeof(wchar16_t);
return NT_STATUS_SUCCESS;
}
static int32_t __fastcall __utf8_to_utf16_handler_4bytes(nt_utf8_callback_args * args)
{
/*************************************************/
/* from: 11110uuu 10uuzzzz 10yyyyyy 10xxxxxx */
/* to: 110110ww wwzzzzyy 110111yy yyxxxxxx */
/*************************************************/
__two_bytes * src_low; /* big endian */
__two_bytes * src_high; /* big endian */
wchar16_t * dst_lead;
wchar16_t * dst_trail;
wchar16_t u;
unsigned char ulow;
unsigned char uhigh;
unsigned char yyyy;
dst_lead = dst_trail = (wchar16_t *)args->dst;
dst_trail++;
if ((uintptr_t)dst_trail >= (uintptr_t)args->dst_cap)
return NT_STATUS_BUFFER_TOO_SMALL;
src_low = src_high = (__two_bytes *)args->src;
src_high++;
/* u */
ulow = src_low->low ^ 0xF0;
uhigh = src_low->high ^ 0x80;
ulow <<= 2;
uhigh >>= 4;
u = ulow | uhigh;
/* 110110ww wwzzzzyy */
*dst_lead = 0xD800;
*dst_lead |= ((u-1) << 6);
*dst_lead |= ((src_low->high ^ 0x80) << 2);
*dst_lead |= ((src_high->low ^ 0x80) >> 4);
/* 110111yy yyxxxxxx */
yyyy = (src_high->low << 4);
*dst_trail = yyyy;
*dst_trail <<= 2;
*dst_trail |= (src_high->high ^ 0x80);
*dst_trail |= 0xDC00;
/* advance source and destination buffer */
args->src += 4;
args->dst = (void *)((uintptr_t)(args->dst) + (2 * sizeof(wchar16_t)));
/* bytes_written */
args->bytes_written += 2 * sizeof(wchar16_t);
return NT_STATUS_SUCCESS;
}
static int32_t __fastcall __update_stream_leftover_info_utf8(
__in_out nt_unicode_conversion_params_utf8_to_utf16 * params)
{
int32_t status;
ptrdiff_t offset;
unsigned char * utf8;
offset = (uintptr_t)params->src + (uintptr_t)params->src_size_in_bytes - (uintptr_t)params->addr_failed;
utf8 = (unsigned char *)params->addr_failed;
/* default status */
status = NT_STATUS_ILLEGAL_CHARACTER;
if (offset == 1) {
if ((utf8[0] >= 0xC2) && (utf8[0] <= 0xF4)) {
/* one leftover byte */
params->leftover_count = 1;
params->leftover_bytes = utf8[0];
params->leftover_bytes <<= 24;
status = NT_STATUS_SUCCESS;
}
} else if (offset == 2) {
if /* ------- */ (((utf8[0] == 0xE0) && (utf8[1] >= 0xA0) && (utf8[1] <= 0xBF))
|| ((utf8[0] >= 0xE1) && (utf8[0] <= 0xEC) && (utf8[1] >= 0x80) && (utf8[1] <= 0xBF))
|| ((utf8[0] == 0xED) && (utf8[1] >= 0x80) && (utf8[1] <= 0x9F))
|| ((utf8[0] >= 0xEE) && (utf8[0] <= 0xEF) && (utf8[1] >= 0x80) && (utf8[1] <= 0xBF))
|| ((utf8[0] == 0xF0) && (utf8[1] >= 0x90) && (utf8[1] <= 0xBF))
|| ((utf8[0] >= 0xF1) && (utf8[0] <= 0xF3) && (utf8[1] >= 0x80) && (utf8[1] <= 0xBF))
|| ((utf8[0] == 0xF4) && (utf8[1] >= 0x80) && (utf8[1] <= 0x8F))) {
/* two leftover bytes */
params->leftover_count = 2;
params->leftover_bytes = utf8[0];
params->leftover_bytes <<= 8;
params->leftover_bytes += utf8[1];
params->leftover_bytes <<= 16;
status = NT_STATUS_SUCCESS;
}
} else if (offset == 3) {
if /* ------- */ (((utf8[0] == 0xF0) && (utf8[1] >= 0x90) && (utf8[1] <= 0xBF))
|| ((utf8[0] >= 0xF1) && (utf8[0] <= 0xF3) && (utf8[1] >= 0x80) && (utf8[1] <= 0xBF))
|| ((utf8[0] == 0xF4) && (utf8[1] >= 0x80) && (utf8[1] <= 0x8F))) {
/* three leftover bytes */
params->leftover_count = 3;
params->leftover_bytes = utf8[0];
params->leftover_bytes <<= 8;
params->leftover_bytes += utf8[1];
params->leftover_bytes <<= 8;
params->leftover_bytes += utf8[2];
params->leftover_bytes <<= 8;
status = NT_STATUS_SUCCESS;
}
}
if (status != NT_STATUS_SUCCESS) {
params->leftover_count = 0;
params->leftover_bytes = 0;
}
return status;
}
int32_t __stdcall __ntapi_uc_convert_unicode_stream_utf8_to_utf16(
__in_out nt_unicode_conversion_params_utf8_to_utf16 * params)
{
int32_t status;
nt_utf8_callback_args args;
ntapi_uc_utf8_callback_fn * callback_fn[5];
callback_fn[0] = (ntapi_uc_utf8_callback_fn *)__utf8_to_utf16_handler_1byte_or_null_termination;
callback_fn[1] = (ntapi_uc_utf8_callback_fn *)__utf8_to_utf16_handler_1byte_or_null_termination;
callback_fn[2] = (ntapi_uc_utf8_callback_fn *)__utf8_to_utf16_handler_2bytes;
callback_fn[3] = (ntapi_uc_utf8_callback_fn *)__utf8_to_utf16_handler_3bytes;
callback_fn[4] = (ntapi_uc_utf8_callback_fn *)__utf8_to_utf16_handler_4bytes;
args.src = params->src;
args.dst = params->dst;
args.dst_cap = (void *)((uintptr_t)(params->dst) + (params->dst_size_in_bytes));
args.bytes_written = params->bytes_written;
status = __ntapi_uc_validate_unicode_stream_utf8(
params->src,
params->src_size_in_bytes,
¶ms->code_points,
¶ms->addr_failed,
callback_fn,
&args);
params->bytes_written = args.bytes_written;
switch (status) {
case NT_STATUS_SUCCESS:
params->addr_failed = 0;
params->leftover_bytes = 0;
params->leftover_count = 0;
return status;
case NT_STATUS_BUFFER_TOO_SMALL:
params->addr_failed = args.src;
params->leftover_bytes = 0;
params->leftover_count = 0;
return status;
default:
status = __update_stream_leftover_info_utf8(params);
}
/* (optimized out on 32-bit architectures) */
params->leftover_bytes <<= (8 * (sizeof(uintptr_t) - sizeof(uint32_t)));
return status;
}
int32_t __stdcall __ntapi_uc_convert_unicode_stream_utf8_to_utf32(
__in_out nt_unicode_conversion_params_utf8_to_utf32 * params)
{
(void)params;
return NT_STATUS_SUCCESS;
}
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